Ex 6.1, 5 (iii)
Last updated at May 29, 2026 by Teachoo
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Exercise Set 6.1
Ex 6.1, 1
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Class 9
Chapter 6 Class 9 - Measuring Space: Perimeter and Area (Ganita Manjar
- Definition (and Quesitons)
- Perimeter of Different Shapes
- Perimeter of a Circle - C/D Ratio
- Pi is Irrational
- Length of an Arc of a Circle
- Problems, Puzzles, and Paradoxes on Perimeter
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Exercise Set 6.1
- Area of Square & Rectangle
- Area of a Parallelogram
- Area of a Triangle
- Heron's Formula
- Circumcircle and Incircle of a Triangle
- Brahmagupta’s Formula for the Area of a Cyclic 4-gon
- Squaring a Rectangle
- Exercise Set 6.2
Transcript
Ex 6.1, 5 (iii) Find the perimeters of the following shapes (taking the arcs to be quarter or half or three-quarters of a circle, as appropriate) Here, Perimeter of given shape = 4 × Length of curved blue line = 4 × Circumference of half circle Let’s find circumference of half circle Circumference of half circle Diameter = 10 cm Radius = r = 𝐷𝑖𝑎𝑚𝑒𝑡𝑒𝑟/2 = 10/2 = 5 cm Circumference of half circle = 1/2 × Circumference of circle = 𝟏/𝟐 × 2𝜋r = 𝜋r = 22/7 × 5 = 𝟏𝟏𝟎/𝟕 cm Now, Perimeter of given shape = 4 × Circumference of half circle = 4 × 110/7 cm = 𝟒𝟒𝟎/𝟕 cm Hence, perimeter of given shape is 𝟒𝟒𝟎/𝟕 cm
